[postprocessor/ffmpeg] Always use the 'file:' protocol for filenames (fixes #6874)

If the filename contains ':' it is interpreted as a protocol.
It also handles filenames starting with '-'.

youtube_dl/downloader/hls.py

@@ -31,7 +31,7 @@ class HlsFD(FileDownloader):
         args = [
             encodeArgument(opt)
             for opt in (ffpp.executable, '-y', '-i', url, '-f', 'mp4', '-c', 'copy', '-bsf:a', 'aac_adtstoasc')]
-        args.append(encodeFilename(tmpfilename, True))
+        args.append(encodeFilename(ffpp._ffmpeg_filename_argument(tmpfilename), True))
 
         self._debug_cmd(args)
 

youtube_dl/postprocessor/ffmpeg.py

@@ -135,7 +135,10 @@ class FFmpegPostProcessor(PostProcessor):
 
         files_cmd = []
         for path in input_paths:
-            files_cmd.extend([encodeArgument('-i'), encodeFilename(path, True)])
+            files_cmd.extend([
+                encodeArgument('-i'),
+                encodeFilename(self._ffmpeg_filename_argument(path), True)
+            ])
         cmd = ([encodeFilename(self.executable, True), encodeArgument('-y')] +
                files_cmd +
                [encodeArgument(o) for o in opts] +
@@ -155,10 +158,10 @@ class FFmpegPostProcessor(PostProcessor):
         self.run_ffmpeg_multiple_files([path], out_path, opts)
 
     def _ffmpeg_filename_argument(self, fn):
-        # ffmpeg broke --, see https://ffmpeg.org/trac/ffmpeg/ticket/2127 for details
-        if fn.startswith('-'):
-            return './' + fn
-        return fn
+        # Always use 'file:' because the filename may contain ':' (ffmpeg
+        # interprets that as a protocol) or can start with '-' (-- is broken in
+        # ffmpeg, see https://ffmpeg.org/trac/ffmpeg/ticket/2127 for details)
+        return 'file:' + fn
 
 
 class FFmpegExtractAudioPP(FFmpegPostProcessor):